潮流计算模型对大电网充裕度评估的影响分析

摘要

潮流计算是大电网充裕度评估的基础，潮流计算模型的选择会对大电网充裕度评估的结果产生影响。介绍大电网充裕度评估的原理，对交流潮流计算模型和直流潮流计算模型进行分析比较，以RBTS可靠性测试系统为例进行算例分析。算例分析结果表明，基于交流潮流的大电网充裕度评估能够计入无功功率和节点电压的影响，计算结果相对精确，但是计算时间代价大；采用直流潮流模型时大电网充裕度评估速度快，但计算结果存在一定误差。%Power flow calculation is the basis of bulk power system adequacy evaluation and its models will have an effect on the calculation results of adequacy indices.The principle of bulk power systems adequacy assessment is presented in this paper.Then alternative currentAC power flow model and direct current DC power flow model are demonstrated and compared.Finally these two kinds of power flow models are applied to typical reliability test system designated as RBTS.Case studies show that when the AC power flow model is used the effects of reactive power and bus voltage can be incorporated and then the adequacy result is more accurate.However when the DC power flow model is used less CPU time is needed but there exist calculation errors of adequacy indices.